Thews



(No Model.)

J. G. MILLER. CENTRAL DRAFTLAMP. I No. 478,802. v Patented July 12, 1892,

WE nomus PETERS cm, PHOTO-LID!!!" wlusmummn o. c.

" Unites. STATES PATENT Crricn.

JOHN C. MILLER, OF IVATERBURY, CONNECTICUT, ASSIGNOR TO THE MAT- THEIVS & WVILLARD MANUFACTURING COMPANY, OF SAME PLACE.

CENTRAL-DRAFT LAMP.

SPECIFICATION forming part of Letters Patent No. 478,802, dated July 12, 1892. Application filed January 6, 1892. Serial No. 417,138- (No model.)

To aZZ whom, it may concern: of the air-distributer and the ribs to hold it Be it known that I, JOHN C. MILLER,-of, firmly in place. That portion D of the air- Waterbury, in the county of New Haven and distributer lying between the upper end of State of Connecticut, have invented a new the said tapered portion and the upper end 5 Improvement in Central-Draft Lamps; and I of the draft-tube A is made enough smaller do hereby declare the following, whentaken in diameter than the diameter of the said in connection with accompanying drawings draft-tube to form an annular chamber E, and the letters of reference marked thereon, which communicates at its lower edge with to be a full, clear, and exact description of the compartments C, virtually formed below IO the same, and which said drawings constitute it by means of the ribs before mentioned. part of this specification, and represent, in- The said compartments C,which are in effect Figure l, a view in side elevation of adraftwide vertical fiues, open into the draft-tube at tube and air-distributer constructed in aca point at or near the lower end of the air-discordance with my invention and assembled tributer and are broadest at theirlowerends, 15 as in use; Fig. 2, a similar view in vertical growing gradually narrower until they reach central section; Fig. 3, a view in horizontal the point where they open into the narrow transverse section on the line a b of Fig.2. annular chamberE aforesaid. By preference My invention relates to an improvement-in and as herein shown I form a rib F between the draft-tubes and air-distributers for centraltapering and straight portions C and D of the 2o draft lamps, the object being to produce a air-distributer, in order to stiffen the same simple construction in which the air-distriband prevent it from being possibly indented uter is frictionally secured in place and in by the upper ends of the ribs in being pressed which the overflow of oil is avoided and curdown into place. Otherwisethan specified, rents of air are jetted upon the base of the the air-distributer may be of any approved 25 flame, so as to produce a superior light. construction. As herein shown, it at no place With these ends in view myinvention conexceeds in diameter the diameter of its porsists in the combination,with a draft-tube protion B, and is constructed with a broad groove vided at its upper end wit-h longitudinal inextending around its upper portion. wardly-projecting inclined seats or ribs, of an By providing the'draft-tube with inwardly- 3o air-distributer having its lower end tapered projecting inclined seats and tapering the in accordance with the inclination of the said lower end of the air-distributer, as described, seats or ribs upon which it is supported. I provide convenient, effective, and simple My invention further consists in certain demeans of securing the distributer firmly in tails of constructionand combinationsof parts, place. Furthermore, that portion of the air 5 as will be hereinafter described, and pointed which in its upward progress through the out in the claims. draft-tube passes upward on the outside of As herein shown, the upper end of the centhe tapering lower end C of the air-distribtral draft-tube A is struck inwardly to form uter and enters into the compartments 0, fourlongitudinalinwardly-projectinginclined before mentioned, is so increased in force in 0 seats or ribs B, which widen gradually from its passage through the said compartments, their upper to their lower ends and gradually which taper from their lower ends upward, increase in theirinward projection in the same that it virtually is jetted into the chamber direction. While it is perhaps the most con- E formed between the draft-tube and the venient and feasible Way to form these seats air-distributor at a point directly above the 5 or ribs by striking them inwardly from the tapered portion of the latter, whereby any tube, I do not limit myself to that construcoil which may escape into the said chamber tion for them. The lower end C of the air- E is driven back again, while the air issuing distributer is tapered in accordance with the from the said chamber E is forced onto the inclination of the said seats or ribs upon base of the flame in such a manner as to pro. 10 50 which it is supported, sufficient friction being duce a very superior light.

developed between the said tapered portion I would have it understood that I do not limit myself to the exact construction herein shown and described, but hold myself at liberty to make such changes and alterations therein as fairly fall within the spirit and scope of my invention.

I am aware that it is old to support an airdistributer upon a projection struck inwardly to provide for an upward draft of air between the outer surface of the distributer and the inner surface of the tube. I am also aware that a tapering distributer is old. I do not, therefore claim any of these constructions broadly.

I-Iaving fully described my invention, what I claim as new, and desire to secure byLetters Patent, is-

1. In a central-draft lamp, the combination, with a draft-tube provided at its upper end with longitudinal inwardly-inclined seats or ribs which gradually increase in their inward projection from their upper to their lower ends, end tapered in accordance with the inclination of the said seats or ribs on which it is supported and its upper end closed and perforated, substantially as set forth,and Whereby the said ribs form friction-seats for the distributer and divide the space between the distributer and tube into compartments or fines broadest at their lower ends, which leadinto the draft-tube.

2. In a central-draft lamp, the combination, with a draft-tube provided at its upper end with longitudinal inwardlyprojecting inclined seats or ribs which gradually increase in their inward projection from their upper to their lower ends, of an air-distributer hav- 1 ing its lower end tapered in accordance with the inclination of the said seats on which it is supported and its upper end closed and perforated and made smaller than the diameter of the tube above said tapered portion, substantially as described, whereby the said ribs upper to their ter having its lower of an air-distributer having its lower i tapered portion,

form friction-seats for the distributer and the space between the distributer and tube is divided into an annular chamber, and a circular series of. vertical flues located below the same and having their narrow upper ends opening into the said chamber, while their broader lower ends lead into the draft-tube. from the draft-tube in which it is placed and 3. In a central-draft lamp, the combination, with a draft-tube having its upper end struck inwardly to form longitudinal inwardly-proj ecting seats or ribs gradually increasing both in inward projection and in width from their lower ends, of an air-distribuend tapered in accordance with the inclination of the said ribs or seats on which it is supported, substantially as set forth, and whereby the said ribs form friction-seats for the distributer and divide the spacebetween the same and the tube into a circular series of compartments or flues,

' which are broader at theirlower than at their upper ends.

l. In a central-draft lamp, the combination, with a draft-tube having its upper end constructed with longitudinal inwardly-projecting inclined seats or ribs which gradually increase in their inward projection from their upper to their lower ends, ter having its lower end tapered in accord- .ance with the inclination of the said ribs of an air-distribuand shouldered at the upper end of its said substantially as described, and whereby the said ribs form friction-seats for the distributer and divide the space between the same and the tube into a circular series of compartments or flues which are broader at their lower than at their upper ends. In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

J OHN C. MILLER. Witnesses:

LUCIEN F. BURPEE, 4 GEO. G. BLAKESLE E. 

